Question 1

Which of the following best describes a solution in chemistry?

Accepted Answer

A homogeneous mixture made of two or more components that form a uniform composition.

Question 2

In a solution of 10 g NaCl dissolved in 500 mL of water, which is the solute and which is the solvent?

Accepted Answer

NaCl is the solute, water is the solvent.

Question 3

Which of the following best defines concentration in the context of solutions?

Accepted Answer

The measurement of the amount of solute in a given amount of solvent.

Question 4

Which of the following mixtures is an example of a colloid?

Accepted Answer

Milk

Question 5

A student mixes sand and water in a beaker. After stirring, the sand settles at the bottom. This mixture is best classified as:

Accepted Answer

A suspension

Question 6

Which of the following is a distinguishing property of a solution compared to a suspension?

Accepted Answer

Solutions are homogeneous at the molecular level.

Question 7

If you add 5 g of sugar to 100 mL of water and stir until all the sugar dissolves, what type of mixture have you created?

Accepted Answer

A solution

Question 8

Which of the following best describes the Tyndall effect?

Accepted Answer

The scattering of light by particles in a colloid.

Question 9

Which of the following is NOT a characteristic of a colloid?

Accepted Answer

Particles can be separated by filtration.

Question 10

A student observes three beakers: A is clear with no visible particles, B is cloudy but particles do not settle, and C has visible particles that settle over time. Which beaker contains a suspension?

Accepted Answer

Beaker C

Question 11

Which of the following statements about mixtures is correct?

Accepted Answer

Colloids and suspensions are both heterogeneous mixtures.

Question 12

Which of the following best explains why salt dissolves in water?

Accepted Answer

Water molecules surround and separate the ions in salt.

Question 13

If a mixture scatters light but does not settle out or separate upon standing, it is most likely a:

Accepted Answer

Colloid

Question 14

Which of the following is the best example of a solution?

Accepted Answer

Salt water

Question 15

A mixture that appears uniform but scatters light and cannot be separated by filtration is called a:

Accepted Answer

Colloid

Solutions and Mixtures: Key Concepts in Chemistry

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